[1] HHS Gen Hosp, Thrombosis Serv, Hamilton, ON, Canada
[2] Sahlgrenska Univ Hosp Oestra, Dept Med, Gothenburg, Sweden
[3] Harvard Univ, Sch Med, Brigham & Womens Hosp, Boston, MA USA
[4] Thrombosis Res Inst, London SW3 6LR, England
[5] Queen Mary Univ London, London, England
[6] McMaster Univ, Dept Med, Hamilton, ON, Canada
[7] Boehringer Ingelheim GmbH & Co KG, Dept Med, Oslo, Norway
[8] Bellevue Hosp, Dept Vasc Pathol, St Etienne, France
[9] Municipal Hosp Friedrichstadt, Med Div 2, Dresden, Germany
[10] Boehringer Ingelheim Pharmaceut Inc, Ridgefield, CT 06877 USA